The former Manchester United midfielder said Bale "gave nothing" to the Madrid cause in the first leg, which finished 2-1 to Juventus.

His comments come amid reports Real could sell Bale this summer, with United a potential suitor of the £85million world-record signing.

But his agent, Jonathan Barnett, has rubbished suggestions Bale will quit the Bernabeu and lashed out at Keane, who is currently Ireland assistant coach after managerial stints at Sunderland and Ipswich.

"Why should we take any notice of comments from people who don't know what they are talking about - and from people who have failed in management?" Barnett told BBC Sport.

"This is only an issue in England. Gareth is at the biggest club in the world. He is one of the best players in the world. He is fine.

"He only listens to relevant comments. He is 100% focussed on Real Madrid."

Despite making fewer passes than Real goalkeeper Iker Casillas at the Juventus Stadium, manager Carlo Ancelotti moved to defend Bale, who cost £85million when he moved from Tottenham two summers ago.

"Gareth Bale was tired," Ancelotti said. "He's just back from an injury and he's too important for us.

"He is our most dangerous player, and because he was tired, I just preferred not to take any risks with him, so I took him off."